<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Decrypt.php 16971 2009-07-22 18:05:45Z mikaelkael $
 */

/**
 * @see Zend_Filter_Decrypt
 */
require_once 'Zend/Filter/Decrypt.php';

/**
 * Decrypts a given file and stores the decrypted file content
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Filter_File_Decrypt extends Zend_Filter_Decrypt
{
	/**
	 * New filename to set
	 *
	 * @var string
	 */
	protected $_filename;

	/**
	 * Returns the new filename where the content will be stored
	 *
	 * @return string
	 */
	public function getFilename()
	{
		return $this->_filename;
	}

	/**
	 * Sets the new filename where the content will be stored
	 *
	 * @param  string $filename (Optional) New filename to set
	 * @return Zend_Filter_File_Encryt
	 */
	public function setFilename($filename = null)
	{
		$this->_filename = $filename;
		return $this;
	}

	/**
	 * Defined by Zend_Filter_Interface
	 *
	 * Decrypts the file $value with the defined settings
	 *
	 * @param  string $value Full path of file to change
	 * @return string The filename which has been set, or false when there were errors
	 */
	public function filter($value)
	{
		if (!file_exists($value)) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception("File '$value' not found");
		}

		if (!isset($this->_filename)) {
			$this->_filename = $value;
		}

		if (file_exists($this->_filename) and !is_writable($this->_filename)) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception("File '{$this->_filename}' is not writable");
		}

		$content = file_get_contents($value);
		if (!$content) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception("Problem while reading file '$value'");
		}

		$decrypted = parent::filter($content);
		$result    = file_put_contents($this->_filename, $decrypted);

		if (!$result) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception("Problem while writing file '{$this->_filename}'");
		}

		return $this->_filename;
	}
}
